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電子電路實驗

電子電路實驗. 實驗三 惠斯頓電橋. 領料. 三用電表 1 K – 1 10K – 1 100 – 1 可變電阻 – 1 ? – 1 ? – 1 ? – 1. 電阻的分類. 固定電阻 可變電阻. 可變電阻介紹. 電阻可在一定範圍變動 由標示可知 三個接腳 電阻值 接線至麵包板. 惠斯頓電橋. 電路架構. 惠斯頓電橋. 原理 電壓產生電流 當 Vbd > Vcd， 電流由 b 點流向 c 點 當 Vbd < Vcd， 電流由 c 點流向 b 點 當 Vbd = Vcd， 電流平衡，沒有電流通過檢流計

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電子電路實驗

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  1. 電子電路實驗 實驗三 惠斯頓電橋

  2. 領料 • 三用電表 • 1K – 1 • 10K – 1 • 100 – 1 • 可變電阻 – 1 • ? – 1 • ? – 1 • ? – 1

  3. 電阻的分類 • 固定電阻 • 可變電阻

  4. 可變電阻介紹 • 電阻可在一定範圍變動 • 由標示可知 • 三個接腳 • 電阻值 • 接線至麵包板

  5. 惠斯頓電橋 • 電路架構

  6. 惠斯頓電橋 • 原理 • 電壓產生電流 • 當Vbd > Vcd，電流由b點流向c點 • 當Vbd < Vcd，電流由c點流向b點 • 當Vbd = Vcd，電流平衡，沒有電流通過檢流計 • 當電橋平衡時： • I1Rb = I2Ra • I1Rs = I2Rx

  7. 惠斯頓電橋 • I1Rb/I1Rs = I2Ra/I2Rx • 固定Ra與Rb • 調整Rs • 求Rx

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